diff --git a/trunk/c5/GNUmakefile b/trunk/c5/GNUmakefile
index c017de4f..6534afb9 100644
--- a/trunk/c5/GNUmakefile
+++ b/trunk/c5/GNUmakefile
@@ -11,11 +11,16 @@ RANLIB = ranlib
 UNAME = $(shell uname)
 ISX86 = $(shell uname -m | grep -c "i.86\|x86_64")
 GCC33ORLATER = $(shell gcc -v 2>&1 | grep -c "gcc version \(3.[3-9]\|[4-9]\)")
+ISMINGW = $(shell uname | grep -c "MINGW32")
 
-ifeq ($(ISX86) $(GCC33ORLATER),1 1)
+ifeq ($(ISX86) $(GCC33ORLATER) $(ISMINGW),1 1 0)	# MINGW32 is missing the memalign function
 CXXFLAGS += -msse2
 endif
 
+ifeq ($(ISMINGW),1)
+LDLIBS += -lws2_32
+endif
+
 ifeq ($(UNAME),)	# for DJGPP, where uname doesn't exist
 CXXFLAGS += -mbnu210
 else